PacificNW_Lover:
Estoy tratando de analizar el archivo / etc / group en un sistema operativo macOS Mojave 10.14.3 utilizando la función de flujo de Java 1.8.
El conjunto completo de líneas dentro de mi archivo / etc / grupo son los siguientes:
nobody:*:-2:
nogroup:*:-1:
wheel:*:0:root
daemon:*:1:root
kmem:*:2:root
sys:*:3:root
tty:*:4:root
operator:*:5:root
mail:*:6:_teamsserver
bin:*:7:
procview:*:8:root
procmod:*:9:root
owner:*:10:
everyone:*:12:
_taskgated:*:13:_taskgated
group:*:16:
staff:*:20:root
_networkd:*:24:
_installassistant:*:25:
_lp:*:26:
_postfix:*:27:
_postdrop:*:28:
certusers:*:29:root,_jabber,_postfix,_cyrus,_calendar,_dovecot
_keytabusers:*:30:_calendar,_jabber,_postfix
_scsd:*:31:
_ces:*:32:
_appstore:*:33:_appstore
utmp:*:45:
authedusers:*:50:
interactusers:*:51:
netusers:*:52:
consoleusers:*:53:
_mcxalr:*:54:
_appleevents:*:55:
_geod:*:56:
_devdocs:*:59:
_sandbox:*:60:
localaccounts:*:61:
netaccounts:*:62:
_mdnsresponder:*:65:
_uucp:*:66:
_ard:*:67:
dialer:*:68:
network:*:69:
_www:*:70:_devicemgr,_teamsserver
_eppc:*:71:_eppc
_cvs:*:72:
_svn:*:73:
_mysql:*:74:
_sshd:*:75:
_qtss:*:76:
_mailman:*:78:
_appserverusr:*:79:
admin:*:80:root
_appserveradm:*:81:
_clamav:*:82:
_amavisd:*:83:
_jabber:*:84:
_appowner:*:87:
_windowserver:*:88:
_spotlight:*:89:
accessibility:*:90:
_tokend:*:91:
_securityagent:*:92:
_calendar:*:93:_teamsserver
_teamsserver:*:94:_devicemgr
_update_sharing:*:95:
_installer:*:96:
_atsserver:*:97:
_lpadmin:*:98:
_unknown:*:99:
_lpoperator:*:100:
_softwareupdate:*:200:_softwareupdate
_guest:*:201:
_coreaudiod:*:202:
_screensaver:*:203:
_developer:*:204:
_locationd:*:205:
_detachedsig:*:207:_locationd
_trustevaluationagent:*:208:
_odchpass:*:209:_teamsserver
_timezone:*:210:
_lda:*:211:
_cvms:*:212:
_usbmuxd:*:213:
_postgres:*:216:_devicemgr,_calendar,_teamsserver,_xserverdocs
_devicemgr:*:220:
_webauthserver:*:221:_teamsserver,_devicemgr
_netbios:*:222:
_warmd:*:224:_warmd
_dovenull:*:227:
_netstatistics:*:228:
_assetcache:*:235:
_coremediaiod:*:236:
_launchservicesd:*:239:
_iconservices:*:240:
_distnote:*:241:
_nsurlsessiond:*:242:
_nsurlstoraged:*:243:
_displaypolicyd:*:244:
_astris:*:245:
_gamecontrollerd:*:247:
_mbsetupuser:*:248:
_ondemand:*:249:
_analyticsusers:*:250:_analyticsd,_networkd,_timed,_reportmemoryexception
_xserverdocs:*:251:
_wwwproxy:*:252:
_mobileasset:*:253:
_findmydevice:*:254:
_datadetectors:*:257:
_captiveagent:*:258:
_ctkd:*:259:
_applepay:*:260:
_hidd:*:261:
_cmiodalassistants:*:262:
_analyticsd:*:263:_analyticsd
_webdeveloper:*:264:
_fpsd:*:265:_fpsd
_timed:*:266:
_reportmemoryexception:*:269:_reportmemoryexception
com.apple.access_ftp:*:395:
com.apple.access_disabled:*:396:
com.apple.access_sessionkey:*:397:
com.apple.access_screensharing:*:398:
com.apple.access_ssh:*:399:
Group.java:
public class Group {
private String gid;
private String name;
private String members;
public Group(String line) {
String[] items = line.split(":");
if (items.length <= 3) {
this.name = items[0];
System.out.print("Name: " + name + ", ");
this.gid = items[2];
System.out.print(" gid: " + gid + ", ");
}
else if (items.length >=3 || this.name != null || "".equals(this.name)){
this.members = items[3];
System.out.println("Members: " + members);
}
}
// Omitted getters & setters for brevity
}
Creado este GroupsParser:
public class GroupParser {
public static List<Group> getAllGroups(String line) {
List<Group> groups = null;
try (Stream<String> stream = Files.lines(Paths.get(line))) {
groups = stream.filter(s -> s.charAt(0) != '#').map(Group::new)
.collect(Collectors.toCollection(ArrayList::new));
}
catch (Exception e) {
e.printStackTrace();
}
return groups;
}
public static void main(String[] args) {
List<Group> groups = GroupParser.getAllGroups("/etc/group");
for (Group group : groups) {
System.out.println("Group: " + group.getName() + ", gid: " + group.getGid() + ", members: " + group.getMembers());
}
}
}
Recibido la siguiente salida (que es evidente su falta de orden y algunos artículos):
Group: nobody, gid: -2, members: null
Group: nogroup, gid: -1, members: null
Group: null, gid: null, members: root
Group: null, gid: null, members: root
Group: null, gid: null, members: root
Group: null, gid: null, members: root
Group: null, gid: null, members: root
Group: null, gid: null, members: root
Group: null, gid: null, members: _teamsserver
Group: bin, gid: 7, members: null
Group: null, gid: null, members: root
Group: null, gid: null, members: root
Group: owner, gid: 10, members: null
Group: everyone, gid: 12, members: null
Group: null, gid: null, members: _taskgated
Group: group, gid: 16, members: null
Group: null, gid: null, members: root
Group: _networkd, gid: 24, members: null
Group: _installassistant, gid: 25, members: null
Group: _lp, gid: 26, members: null
Group: _postfix, gid: 27, members: null
Group: _postdrop, gid: 28, members: null
Group: null, gid: null, members: root,_jabber,_postfix,_cyrus,_calendar,_dovecot
Group: null, gid: null, members: _calendar,_jabber,_postfix
Group: _scsd, gid: 31, members: null
Group: _ces, gid: 32, members: null
Group: null, gid: null, members: _appstore
Group: utmp, gid: 45, members: null
Group: authedusers, gid: 50, members: null
Group: interactusers, gid: 51, members: null
Group: netusers, gid: 52, members: null
Group: consoleusers, gid: 53, members: null
Group: _mcxalr, gid: 54, members: null
Group: _appleevents, gid: 55, members: null
Group: _geod, gid: 56, members: null
Group: _devdocs, gid: 59, members: null
Group: _sandbox, gid: 60, members: null
Group: localaccounts, gid: 61, members: null
Group: netaccounts, gid: 62, members: null
Group: _mdnsresponder, gid: 65, members: null
Group: _uucp, gid: 66, members: null
Group: _ard, gid: 67, members: null
Group: dialer, gid: 68, members: null
Group: network, gid: 69, members: null
Group: null, gid: null, members: _devicemgr,_teamsserver
Group: null, gid: null, members: _eppc
Group: _cvs, gid: 72, members: null
Group: _svn, gid: 73, members: null
Group: _mysql, gid: 74, members: null
Group: _sshd, gid: 75, members: null
Group: _qtss, gid: 76, members: null
Group: _mailman, gid: 78, members: null
Group: _appserverusr, gid: 79, members: null
Group: null, gid: null, members: root
Group: _appserveradm, gid: 81, members: null
Group: _clamav, gid: 82, members: null
Group: _amavisd, gid: 83, members: null
Group: _jabber, gid: 84, members: null
Group: _appowner, gid: 87, members: null
Group: _windowserver, gid: 88, members: null
Group: _spotlight, gid: 89, members: null
Group: accessibility, gid: 90, members: null
Group: _tokend, gid: 91, members: null
Group: _securityagent, gid: 92, members: null
Group: null, gid: null, members: _teamsserver
Group: null, gid: null, members: _devicemgr
Group: _update_sharing, gid: 95, members: null
Group: _installer, gid: 96, members: null
Group: _atsserver, gid: 97, members: null
Group: _lpadmin, gid: 98, members: null
Group: _unknown, gid: 99, members: null
Group: _lpoperator, gid: 100, members: null
Group: null, gid: null, members: _softwareupdate
Group: _guest, gid: 201, members: null
Group: _coreaudiod, gid: 202, members: null
Group: _screensaver, gid: 203, members: null
Group: _developer, gid: 204, members: null
Group: _locationd, gid: 205, members: null
Group: null, gid: null, members: _locationd
Group: _trustevaluationagent, gid: 208, members: null
Group: null, gid: null, members: _teamsserver
Group: _timezone, gid: 210, members: null
Group: _lda, gid: 211, members: null
Group: _cvms, gid: 212, members: null
Group: _usbmuxd, gid: 213, members: null
Group: null, gid: null, members: _devicemgr,_calendar,_teamsserver,_xserverdocs
Group: _devicemgr, gid: 220, members: null
Group: null, gid: null, members: _teamsserver,_devicemgr
Group: _netbios, gid: 222, members: null
Group: null, gid: null, members: _warmd
Group: _dovenull, gid: 227, members: null
Group: _netstatistics, gid: 228, members: null
Group: _assetcache, gid: 235, members: null
Group: _coremediaiod, gid: 236, members: null
Group: _launchservicesd, gid: 239, members: null
Group: _iconservices, gid: 240, members: null
Group: _distnote, gid: 241, members: null
Group: _nsurlsessiond, gid: 242, members: null
Group: _nsurlstoraged, gid: 243, members: null
Group: _displaypolicyd, gid: 244, members: null
Group: _astris, gid: 245, members: null
Group: _gamecontrollerd, gid: 247, members: null
Group: _mbsetupuser, gid: 248, members: null
Group: _ondemand, gid: 249, members: null
Group: null, gid: null, members: _analyticsd,_networkd,_timed,_reportmemoryexception
Group: _xserverdocs, gid: 251, members: null
Group: _wwwproxy, gid: 252, members: null
Group: _mobileasset, gid: 253, members: null
Group: _findmydevice, gid: 254, members: null
Group: _datadetectors, gid: 257, members: null
Group: _captiveagent, gid: 258, members: null
Group: _ctkd, gid: 259, members: null
Group: _applepay, gid: 260, members: null
Group: _hidd, gid: 261, members: null
Group: _cmiodalassistants, gid: 262, members: null
Group: null, gid: null, members: _analyticsd
Group: _webdeveloper, gid: 264, members: null
Group: null, gid: null, members: _fpsd
Group: _timed, gid: 266, members: null
Group: null, gid: null, members: _reportmemoryexception
Group: com.apple.access_ftp, gid: 395, members: null
Group: com.apple.access_disabled, gid: 396, members: null
Group: com.apple.access_sessionkey, gid: 397, members: null
Group: com.apple.access_screensharing, gid: 398, members: null
Group: com.apple.access_ssh, gid: 399, members: null
Group: nobody, gid: -2, members: null
Group: nogroup, gid: -1, members: null
Group: null, gid: null, members: root
Group: null, gid: null, members: root
Group: null, gid: null, members: root
Group: null, gid: null, members: root
Group: null, gid: null, members: root
Group: null, gid: null, members: root
Group: null, gid: null, members: _teamsserver
Group: bin, gid: 7, members: null
Group: null, gid: null, members: root
Group: null, gid: null, members: root
Group: owner, gid: 10, members: null
Group: everyone, gid: 12, members: null
Group: null, gid: null, members: _taskgated
Group: group, gid: 16, members: null
Group: null, gid: null, members: root
Group: _networkd, gid: 24, members: null
Group: _installassistant, gid: 25, members: null
Group: _lp, gid: 26, members: null
Group: _postfix, gid: 27, members: null
Group: _postdrop, gid: 28, members: null
Group: null, gid: null, members: root,_jabber,_postfix,_cyrus,_calendar,_dovecot
Group: null, gid: null, members: _calendar,_jabber,_postfix
Group: _scsd, gid: 31, members: null
Group: _ces, gid: 32, members: null
Group: null, gid: null, members: _appstore
Group: utmp, gid: 45, members: null
Group: authedusers, gid: 50, members: null
Group: interactusers, gid: 51, members: null
Group: netusers, gid: 52, members: null
Group: consoleusers, gid: 53, members: null
Group: _mcxalr, gid: 54, members: null
Group: _appleevents, gid: 55, members: null
Group: _geod, gid: 56, members: null
Group: _devdocs, gid: 59, members: null
Group: _sandbox, gid: 60, members: null
Group: localaccounts, gid: 61, members: null
Group: netaccounts, gid: 62, members: null
Group: _mdnsresponder, gid: 65, members: null
Group: _uucp, gid: 66, members: null
Group: _ard, gid: 67, members: null
Group: dialer, gid: 68, members: null
Group: network, gid: 69, members: null
Group: null, gid: null, members: _devicemgr,_teamsserver
Group: null, gid: null, members: _eppc
Group: _cvs, gid: 72, members: null
Group: _svn, gid: 73, members: null
Group: _mysql, gid: 74, members: null
Group: _sshd, gid: 75, members: null
Group: _qtss, gid: 76, members: null
Group: _mailman, gid: 78, members: null
Group: _appserverusr, gid: 79, members: null
Group: null, gid: null, members: root
Group: _appserveradm, gid: 81, members: null
Group: _clamav, gid: 82, members: null
Group: _amavisd, gid: 83, members: null
Group: _jabber, gid: 84, members: null
Group: _appowner, gid: 87, members: null
Group: _windowserver, gid: 88, members: null
Group: _spotlight, gid: 89, members: null
Group: accessibility, gid: 90, members: null
Group: _tokend, gid: 91, members: null
Group: _securityagent, gid: 92, members: null
Group: null, gid: null, members: _teamsserver
Group: null, gid: null, members: _devicemgr
Group: _update_sharing, gid: 95, members: null
Group: _installer, gid: 96, members: null
Group: _atsserver, gid: 97, members: null
Group: _lpadmin, gid: 98, members: null
Group: _unknown, gid: 99, members: null
Group: _lpoperator, gid: 100, members: null
Group: null, gid: null, members: _softwareupdate
Group: _guest, gid: 201, members: null
Group: _coreaudiod, gid: 202, members: null
Group: _screensaver, gid: 203, members: null
Group: _developer, gid: 204, members: null
Group: _locationd, gid: 205, members: null
Group: null, gid: null, members: _locationd
Group: _trustevaluationagent, gid: 208, members: null
Group: null, gid: null, members: _teamsserver
Group: _timezone, gid: 210, members: null
Group: _lda, gid: 211, members: null
Group: _cvms, gid: 212, members: null
Group: _usbmuxd, gid: 213, members: null
Group: null, gid: null, members: _devicemgr,_calendar,_teamsserver,_xserverdocs
Group: _devicemgr, gid: 220, members: null
Group: null, gid: null, members: _teamsserver,_devicemgr
Group: _netbios, gid: 222, members: null
Group: null, gid: null, members: _warmd
Group: _dovenull, gid: 227, members: null
Group: _netstatistics, gid: 228, members: null
Group: _assetcache, gid: 235, members: null
Group: _coremediaiod, gid: 236, members: null
Group: _launchservicesd, gid: 239, members: null
Group: _iconservices, gid: 240, members: null
Group: _distnote, gid: 241, members: null
Group: _nsurlsessiond, gid: 242, members: null
Group: _nsurlstoraged, gid: 243, members: null
Group: _displaypolicyd, gid: 244, members: null
Group: _astris, gid: 245, members: null
Group: _gamecontrollerd, gid: 247, members: null
Group: _mbsetupuser, gid: 248, members: null
Group: _ondemand, gid: 249, members: null
Group: null, gid: null, members: _analyticsd,_networkd,_timed,_reportmemoryexception
Group: _xserverdocs, gid: 251, members: null
Group: _wwwproxy, gid: 252, members: null
Group: _mobileasset, gid: 253, members: null
Group: _findmydevice, gid: 254, members: null
Group: _datadetectors, gid: 257, members: null
Group: _captiveagent, gid: 258, members: null
Group: _ctkd, gid: 259, members: null
Group: _applepay, gid: 260, members: null
Group: _hidd, gid: 261, members: null
Group: _cmiodalassistants, gid: 262, members: null
Group: null, gid: null, members: _analyticsd
Group: _webdeveloper, gid: 264, members: null
Group: null, gid: null, members: _fpsd
Group: _timed, gid: 266, members: null
Group: null, gid: null, members: _reportmemoryexception
Group: com.apple.access_ftp, gid: 395, members: null
Group: com.apple.access_disabled, gid: 396, members: null
Group: com.apple.access_sessionkey, gid: 397, members: null
Group: com.apple.access_screensharing, gid: 398, members: null
Group: com.apple.access_ssh, gid: 399, members: null
Pregunta (s):
Esta salida no parece ordenó
Grupo: nadie, gid: -2, miembros: null
Grupo: nogroup, gid: -1, los miembros: null
¿Por qué recibo esto, en el medio nogroup y la rueda?
¿Hay una mejor manera de extraer estos equipos? ¿Por qué no puedo ver kmem o en cualquier lugar de la rueda?
¿Hay una manera de comprobar / a solucionar este problema a través de corrientes?
también:
El centro de la cuestión reside en el constructor que está utilizando en la cartografía como .map(Group::new). La lógica del constructor implementado actualmente es una razón para algunas preguntas que surjan. Tratando de explicar cómo a continuación:
public Group(String line) {
String[] items = line.split(":"); // you split up the string into contents based on ':' separator
en la condición de comprobar si los contenidos están divididos en menor o igual a 3 partes, también se ha hecho una suposición aquí que el tamaño de la matriz sería al menos 3, que es lo que pretende el acceso al hacer items[2]. Aviso embargo, si el items.length podría haber sido 2, la ifcondición habría permitido con éxito que termina recibiendo un AIOOBE para este tipo de acceso todavía.
if (items.length <= 3) {
this.name = items[0];
System.out.print("Name: " + name + ", ");
this.gid = items[2];
System.out.print(" gid: " + gid + ", ");
}
cuando el contenido de la cadena podría ser dividida en más de 3 partes, se tiende a no inicializar el name, gidpor eso Groupy por lo tanto usted tiene esas nulls en su salida.
else {
this.members = items[3];
System.out.println("Members: " + members);
}
}
¿Hay una mejor manera de extraer estos equipos? ¿Por qué no puedo ver kmem o en cualquier lugar de la rueda?
La sección relacionada con manipulación de nulllos valores de inicialización de ellas habría resuelto por ella.
Para evitar NPE así, es posible que desee inicializar groupsa una lista vacía;
List<Group> groups = new ArrayList<>();
Una implementación más simple basado en la suposición de que la cadena siempre tendría 3 o más componentes cuando se separa usando :podría ser:
public Group(String line) {
String[] items = line.split(":");
this.name = items[0];
this.gid = Integer.parseInt(items[2]);
if (items.length > 3){
this.members = items[3];
}
}